Well, there aren't many games in there... Other online Flash repositories offer orders of magnitude more games, about 20-30% of them perfectly playable on the Pocket PC; for example, at
http://www.killsometime.com/ . In
the article on Pocket PC Flash players, I've elaborated on this question a lot.
Still, it's worth checking out this site to look around - but don't forget there are tons of other Pocket PC-compatible Flash games out there.